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Configure LLVM module PIC level

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As of LLVM 9, this is required for 32-bit PowerPC to properly generate
PLT references. Previously, only BigPIC was supported; now LLVM supports
both BigPIC and SmallPIC, and there is no default value provided.
This commit is contained in:
Samuel Holland 2019-11-03 10:52:00 -06:00
parent 91fd6283e6
commit 1943079361
3 changed files with 9 additions and 0 deletions
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4
src/librustc_codegen_llvm/context.rs
View file

@ -203,6 +203,10 @@ pub unsafe fn create_module(
let llvm_target = SmallCStr::new(&sess.target.target.llvm_target);
llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
if get_reloc_model(sess) == llvm::RelocMode::PIC {
llvm::LLVMRustSetModulePICLevel(llmod);
}
if is_pie_binary(sess) {
llvm::LLVMRustSetModulePIELevel(llmod);
}

1
src/librustc_codegen_llvm/llvm/ffi.rs
View file

@ -1805,6 +1805,7 @@ extern "C" {
pub fn LLVMRustSetComdat(M: &'a Module, V: &'a Value, Name: *const c_char);
pub fn LLVMRustUnsetComdat(V: &Value);
pub fn LLVMRustSetModulePICLevel(M: &Module);
pub fn LLVMRustSetModulePIELevel(M: &Module);
pub fn LLVMRustModuleBufferCreate(M: &Module) -> &'static mut ModuleBuffer;
pub fn LLVMRustModuleBufferPtr(p: &ModuleBuffer) -> *const u8;

4
src/rustllvm/PassWrapper.cpp
View file

@ -754,6 +754,10 @@ LLVMRustSetDataLayoutFromTargetMachine(LLVMModuleRef Module,
unwrap(Module)->setDataLayout(Target->createDataLayout());
}
extern "C" void LLVMRustSetModulePICLevel(LLVMModuleRef M) {
unwrap(M)->setPICLevel(PICLevel::Level::BigPIC);
}
extern "C" void LLVMRustSetModulePIELevel(LLVMModuleRef M) {
unwrap(M)->setPIELevel(PIELevel::Level::Large);
}